Please upload the doc to Dropbox.com and then post the link here or PM me with the link. Need to look into the file and if it successfully exports to IDML will send the file for you to try opening it again.

Please help me to understand why Adobe would allow a document to be saved out in a format that is not able to be opened again, converted back or open-able in another program? This doesn't make any sense to me, and is disappointing to know I have to completely rebuild this document.